On Thu, Jun 4, 2015 at 12:29 PM, Matthew Knepley <[email protected]> wrote:
> On Thu, Jun 4, 2015 at 10:31 AM, Justin Chang <[email protected]> wrote: > >> Yeah I saw his recommendation and am trying it out. But I am not sure >> what most of those parameters mean. For instance: >> >> 1) What does -pc_gamg_agg_nsmooths refer to? >> > > This is always 1 (its the definition of smoothed aggregation). Mark allows > 0 to support unsmoothed aggregation, which may be > better for easy problems on extremely large machines. > > >> 2) Does increase in the threshold of -pc_gamg_threshold translate to >> making the coarsening faster? >> > > Yes, I believe so (easy to check). > Other way around.
